After lots of shuffling around (and spending LP to buy some new implants, plus a couple million ISK at Jita for some more T2 capacitor improving gear
), my Osprey is now capable of repairing remotely 768 shields per five seconds at a range of 50km, while staying cap-stable at around 25%. Last Sunday I was able to rep 372 per 5 seconds from 30km, so quite an improvement to that in my modest and humble opinion
Also, the Osprey has an AB fitted, and can use it and rep for 384 shields per 5 seconds while staying cap stable.
This comes at a cost though. Can't rep any armour or transfer any cap at all
Then again, based on last Sundays experiences, it felt like Osprey really is intended for shield repping only. In fact, looking at the Osprey special abilities ("Special Ability: 20% bonus to mining laser yield per level. 10% bonus to capacitor use of shield transporters per level. 500% bonus to range of shield transporters." ie no bonus to armour rep or cap transfer), you don't have to be a rocket scientist to come to that conclusion :p
Also, I don't in fact use the Gistii small reppers that Red bought. I've dropped them to Corp hangar. Altough I did already tool around with a frigate who would be able to rep 200/5 sec with those, so if needed for small scale action (say, some mission where only frigates can enter or some such), then I'd be more than willing to try it out. I seem to enjoy myself keeping others up, altough I sorely need advice and experience how to keep myself up when I come under fire (currently the modus operandi when under fire is "Warp the hell out!" which I don't think is necessarily the best way to handle the situation).